<dependency>
 <groupId>javax.servlet</groupId>
 <artifactId>javax.servlet-api</artifactId>
 <version>3.0.1</version>
 <scope>provided</scope> // 这个是作用域
</dependency>
<dependency>
 <groupId>javax.servlet.jsp</groupId>
 <artifactId>jsp-api</artifactId>
 <version>2.2</version>
 <scope>provided</scope> // 这个是作用域
</dependency>

<plugin>
 <groupId>org.apache.tomcat.maven</groupId>
 <artifactId>tomcat7-maven-plugin</artifactId>
 <version>2.2</version>
</plugin>

<servlet-mapping>
 <servlet-name>default </servlet-name>
 <url-pattern>*.js</url-pattern>
 <url-pattern>*.css</url-pattern>
 <url-pattern>*.map</url-pattern>
 <url-pattern>*.jpg</url-pattern>
 <url-pattern>*.png</url-pattern>
 <url-pattern>*.eot</url-pattern>
 <url-pattern>*.svg</url-pattern>
 <url-pattern>*.ttf</url-pattern>
 <url-pattern>*.woff</url-pattern>
 <url-pattern>*.otf</url-pattern>
 <url-pattern>*.woff2</url-pattern>
 <url-pattern>*.gif</url-pattern>
</servlet-mapping>

<%
 String path = request.getContextPath();
 String basePath = request.getScheme() + "://"
   + request.getServerName() + ":" + request.getServerPort()
   + path + "/";
%>

<link rel="stylesheet" href="<%=basePath%>/css/bootstrap.min.css" rel="external nofollow" type="text/css">